1 files changed, 1 insertions, 1 deletions
diff --git a/config.mk b/config.mk
index 9bafe24..c7eb5ca 100644
--- a/config.mk
+++ b/config.mk
@@ -3,6 +3,6 @@ MANPREFIX = $(PREFIX)/share/man
 
 CC = cc
 
-CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700
+CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_GNU_SOURCE
 CFLAGS   = -std=c11 -Wall -Wextra -O2
 LDFLAGS  = -s -lm